Support escaping braces

[CathalMullan]

Not as robust as matchit, but good enough. We prevent the use of certain characters in parameter names/constraints to keep things simple.

[codspeed-hq[bot]]

CodSpeed Performance Report

Merging #108 will degrade performances by 5.92%

_{Comparing 28-support-escaping-and-in-paths (c46a8fb) with main (9767733)}

Summary

⚡ 1 improvements ❌ 4 regressions ✅ 17 untouched benchmarks

:warning: Please fix the performance issues or acknowledge them on CodSpeed.

Benchmarks breakdown

	Benchmark	main	28-support-escaping-and-in-paths	Change
⚡	matchit benchmarks/gonzales	5 µs	4.9 µs	+2.37%
❌	matchit benchmarks/matchit	5.2 µs	5.5 µs	-5.92%
❌	matchit benchmarks/path-table	9.1 µs	9.3 µs	-2.25%
❌	matchit benchmarks/path-tree	7.7 µs	7.9 µs	-2.9%
❌	matchit benchmarks/wayfind	9.3 µs	9.5 µs	-2.16%